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Scientists know why leaves turn yellow in the fall: Chlorophyll breaks down, revealing the yellow pigment that was there all along. But red? Red is a different story altogether. Leaves have to make a new pigment to turn red. Why would a dying leaf do that? Scientists don’t really know. NPR science correspondent Nell Greenfieldboyce reports on the leading hypotheses out there.
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Interested in more seasonal science? Email us your ideas at [email protected].
Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.
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Read more of Nell's reporting on this topic.
Interested in more seasonal science? Email us your ideas at [email protected].
Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.
Learn more about sponsor message choices: podcastchoices.com/adchoices
NPR Privacy Policy
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